A 35-foot steel column fell off a crane this morning at the World Trade Center, crushing a vehicle on the site and leading to a partial shutdown of construction, officials said.

The incident occurred just before 10 a.m. One minor injury was reported – a construction worker slipped and fell while running near the fallen steel.

The accident occurred at the site of the construction of Tower 4, owned by developer Larry Silverstein. Construction of that building and at the 9/11 memorial and museum was shut down for a police investigation.

Additional information is expected later today.

The 16-acre site is largely cordoned off as crews continue rebuilding. The only area open to the public is the memorial, which was unveiled in September.